What is the minimum size circuit conductor for Motor #1 using Figure 230.271?

The minimum size circuit conductor for a motor is determined based on the motor's full-load current and the guidelines provided in the National Electrical Code (NEC), particularly using Figure 230.271. This figure provides specific conductor sizes in relation to different full-load currents based on the motor's horsepower and whether it's single-phase or three-phase.

For Motor #1, the calculated minimum conductor size must be based on its rated full-load current, taking into account factors such as ambient temperature and the conductor material. In general, for larger motors or those operating under specific conditions—like higher environmental temperatures or longer distances that could cause voltage drop—the conductor size must be increased.

Choosing the largest size conductor ensures that the motor can operate safely under load without overheating or experiencing voltage drop issues. Given this, if the correct answer is 6 AWG, it indicates that for the parameters associated with Motor #1, a larger conductor is necessary to adequately handle the electrical load and ensure safe operation.

Thus, utilizing the specification from Figure 230.271, it suggests that 6 AWG is the appropriate minimum size to meet the requirements for both safety and performance for Motor #1.